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Mid-Holocene climate in Northern Minnesota

Quaternary Research

By:
, ,
DOI: 10.1016/0033-5894(87)90064-0

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Abstract

Study of Holocene ostracodes and diatoms from Elk Lake, in North-Central Minnesota, indicates that the local climate of the mid-Holocene can be subdivided into three intervals. Throughout interval 1 (ca. 7800 to 6700 yr B.P.), climate was colder and much drier than today. During intervals 2 and 3 (ca. 6700 to 4000 yr B.P.) average mean-annual air temperatures approached the modern mean (3.7??C), but warm summers persisted throughout interval 2, whereas during interval 3 warm summers fell into discrete episodes. Furthermore, average mean-annual precipitation was about 85 and 90% of modern during intervals 2 and 3, respectively. Transition times between the principal intervals were less than 50 yr. The expected effects of a retreating Laurentide Ice Sheet that initially maintained a winter-style circulation, followed by transitional climate states, and finally a near-modern circulation pattern may explain these local climatic events. ?? 1987.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Mid-Holocene climate in Northern Minnesota
Series title:
Quaternary Research
DOI:
10.1016/0033-5894(87)90064-0
Volume
28
Issue:
2
Year Published:
1987
Language:
English
Publisher:
Elsevier
Publisher location:
Amsterdam, Netheralnds
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Quaternary Research
First page:
263
Last page:
273
Number of Pages:
11